... in information retrieval, pages 314-321. ACM. Giambattista Amati, Edgardo Ambrosi, Marco Bianc-hi, Carlo Gaibisso, and Giorgio Gambosi. 2007. FUB, IASI-CNR and University of Tor Vergata at ... represented by a bag-of-word. Among the words, there is a topic term Avatar (t1) occurring twice, i.e. Avatar in A and Avatar in C, and two senti-ment words comfortable (o1) and favorite (o2) ... 1368fortable (o1) are also regarded as relevant opi-nion mistakenly, creating a false positive. In re-ality comfortable (o1) describes “the seats in IMAX”, which is an irrelevant opinion, and...